<html>
    <head>
        <title>demo</title>
        <style type="text/css">
            #demo
            {
                width:150px;
                height:150px;
                background-color:gray;
                clip-path:polygon(0px 0px,100px 0px,150px 50px,100px 100px,0px 100px);
            }

        </style>
    </head>
    <body>
    <div id="demo">

    </div>
    </body>
</html>
